Class: Observable

Subclasses

• ol.Object

Extends

• goog.events.EventTarget

Methods

ol.Observable.unByKey(key)

src/ol/observable.js, line 41

Removes an event listener using the key returned by on() or once().

Name	Type	Description
key	goog.events.Key	The key returned by on() or once().

changed() experimental

src/ol/observable.js, line 50

Increases the revision counter and dispatches a 'change' event.

dispatchEvent(event) experimental

src/ol/observable.js, line 72

Dispatches an event and calls all listeners listening for events of this type. The event parameter can either be a string or an Object with a type property.

Name	Type	Description
event	goog.events.EventLike	Event object.

getRevision(){number} experimental

src/ol/observable.js, line 81

Get the version number for this object. Each time the object is modified, its version number will be incremented.

Returns:

Revision.

on(type, listener, opt_this){goog.events.Key}

src/ol/observable.js, line 94

Listen for a certain type of event.

Name	Type	Description
type	string | Array.<string>	The event type or array of event types.
listener	function	The listener function.
this	Object	The object to use as this in listener.

Returns:

Unique key for the listener.

once(type, listener, opt_this){goog.events.Key}

src/ol/observable.js, line 107

Listen once for a certain type of event.

Name	Type	Description
type	string | Array.<string>	The event type or array of event types.
listener	function	The listener function.
this	Object	The object to use as this in listener.

Returns:

Unique key for the listener.

un(type, listener, opt_this)

src/ol/observable.js, line 120

Unlisten for a certain type of event.

Name	Type	Description
type	string | Array.<string>	The event type or array of event types.
listener	function	The listener function.
this	Object	The object which was used as this by the listener.

unByKey(key)

src/ol/observable.js, line 133

Removes an event listener using the key returned by on() or once(). Note that using the ol.Observable.unByKey static function is to be preferred.

Name	Type	Description
key	goog.events.Key	The key returned by on() or once().